Research Article
[Retracted] Study on Dynamic Evolution of Overburden Rock Movement and Mining-Induced Stress of Ultra-high Working Face
Table 1
Physical and mechanical parameters of coal and rock.
| Name | Elastic Modulus (GPa) | Poisson’s ratio | Tensile strength (MPa) | Compressive strength (MPa) |
| Main roof | 30.943 | 0.27 | 7.14 | 25.55 | Immediate roof | 40.313 | 0.23 | 6.28 | 14.25 | Coal | 23.872 | 0.25 | 2.1 | 11.68 | Floor | 47.350 | 0.22 | 6.77 | 22.05 |
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